I was on iOS 5 beta 3 around 7-8 last night and it died on me (music was still playing though...but I can't get passed the screen - when I plugged into itunes it said to update)...I am in Canada...it would have been nice if they had given us some warning...I've been without my phone for the entire day...I don't think i'll be able to do a backup before I reinstall either...what a pain...
You realize that Apple tells you many times that you should NOT install betas on your mainstream devices. Your fault if you did.